Analysis Of The Influence Of Train Without Vertical Dynamic Characteristics Of Double-block Ballastless Track

In order to alleviate the pressure of railway transportation of China, collinear mode of passengers and freights transport is adopted in part of existing railway line after the speed-raising reform and initial operation of passenger dedicated line. For the mixed passenger and freight railways, the contradiction between transport capacity and traffic volume is prominent. With the increase of the vehicle axle load of freight vehicle and the speed of passenger vehicle, impact action between wheel and rail continues to increase, exacerbating the damaging effects of vehicles on the track structure and shortening the life of the track structure, which could increase the maintenance workload. Therefore, there is great theoretical significance and engineering application background in the study on vertical dynamic performance of ballastless track under the condition of collinear transport of passengers and freights. The main research works in the present dissertation involves:(1) The vertical dynamics model of the vehicles-double-block ballastless track is established based on the theory of wheel track dynamics, the ballastless track dynamics simulation under different wheel-rail motivation conditions including weld projection irregularity, weld depression irregularity, track vertical profile irregularity and track distortion irregularity are also demonstrated.(2) The impact of200km/h passenger and120km/h freight vehicle on the double-block ballastless track dynamic characteristics under the action of different height of weld projection irregularity, different deepth of weld depression irregularity, different amplitude of track vertical profile irregularity, different amplitude track distortion irregularity are mainly analyzed.(3) A comparative analysis of dynamic performance of double-block ballastless track caused by200km/h passenger and120km/h freight vehicle under the same track irregularity is made, and the effects of different trains on double-block ballastless track force and deformation is evaluated.